Based　on　the　requirement　of　earthquake　resistance　and　disaster　prevention　in　city＇s　master　planning,　taking　the　city＇s　urban　disaster　prevention　function　and　safety　of　residents　in　the　great　earthquake,　large　earthquake,　middle　seism　into　account,　an　idea　for　planning　the　layout　of　seismic　disaster-prevention　space　treating　city　as　an　object　was　brought　forward　in　this　thesis.　Especially,　we　mainly　studied　the　restrictive　conditions　of　the　urban　planning　and　construction　from　urban　disaster　prevention　and　reasonably　planned　urban　disaster　prevention　security　space　structure　and　layout.　Then　it　would　certainly　gain　the　spatial　pattern　of　disaster-prevention　and　obtain　the　right　resources　of　earthquake　emergency　relief,　and　ensure　the　safety　of　cities　against　earthquake　disaster.